For its second weekend, the 15th annual Ultra Music Festival set Miami on fire on March 22, 23, and 24. The annual electronic music bacchanal brought out heavy hitters like Avicii, David Guetta, Major Lazer, Carl Cox, the final performance from Swedish House Mafia, and a bevvy of yeasayin' indie rock ringers to boot. Slap on some sunblock and see our pics.